高浓度沙泥沉降建模及对声传播能量的影响分析

对非刚性水下目标和事件的检测是水下安全警戒的重要内容之一。论文以港口疏浚导致的短时海区内高浓度沙泥侵入为例,探索基于声传感器收发分置的非刚性水下目标检测方法。基于沙泥沉降和声线传播模型,研究非刚性目标在沉降过程中形状、位置变迁对声传播能量及结构的影响规律。计算机仿真与海上实验均表明,局部高浓度泥团在沉降过程中,其形状、密度等指标参数会随时间发生变迁,并对经过其沉降区域的声线能量及结构造成明显影响。通过检测接收声信号能量、结构随沙泥沉降变迁的关系,可实现对水下侵入目标存在性的检测,并为开展进一步的反演、跟踪提供支持,具有一定的研究意义和参考价值。 

Modeling for the sedimentation of dredger and analysis of the influence on sound propagation characteristics

The detection of non-rigid target and event is one of the important content of underwater security. Taklng the dredging leads to a short-term high concentration of sand and mud as an example, the non-rigid underwater target detection method based on acoustic sensor transceiver was explored. Based on the sedimentation of sand and mud and the model of acoustic propagation, the law of non-rigid target's shape, location change influence the sound propagation and energy structure were studied. Computer simulation and experiment on the sea both indicated that the shape and density parameters ware changed and while through the dumping area the ray energy and construction were influenced obviously. By detecting the relationship among receiving acoustic signal energy and the structure with the sedimentation of sand and mud can realize the underwater detection of invasion objective, which can provide support for further inversion, tracking and have certain research significance and reference value.